[apdl rigid shift of knots: strength in knots... possible? ? ? ? ♪

[volaff]

Bye to all,
I have a doubt that I hope to help me solve this.

45672295.png

I have two shell181 (skin) elements that are connected by beam4(reverse) elements.

to simulate the contact between the skins I used the cp command between the nodes of the ends of the rivets.


in teroia, if I use the cp command between a pair of knots I should have as result that the element between the nodes (cp) undergoes a rigid shift: in this case the forces on the element should be null.

I used etable on beam4 elements by listing the forces luno x,y,z for knot i and knot j.

elementn.png


for the element in figure that connects two knots (cp) I have:

print element table items per element

[Bleep] [Bleep]

stat current current current current current
_
194694 0.65414e-12 0.65414e-12 -25.296 -25.296 -4.0277 -4.0277

if I use the nforce command I get:

node fx fy fz mx my mz
18006 4.028 -25.30 -0.6541e-12 17.71 2.819 -0.5755e-11
50143 -4.028 25.30 0.6541e-12 1 7.71 2.819 -0.5752e-11

I can't honestly explain this behavior to me? ? ?

Has anyone had such a problem? !
I believe that the core of my problem lies in this: I've been banging my head for months now, and I can't find an explanation.


Thank you all.
Good day